Acts 5:26

But Peter was following Him at a distance as far as the courtyard of the high priest, and entered in, and sat down with the officers to see the outcome.

And he went away and discussed with the chief priests and officers how he might betray Him to them.

And when they had threatened them further, they let them go (finding no basis on which to punish them) on account of the people, because they were all glorifying God for what had happened;

But the officers who came did not find them in the prison, and they returned and reported back,

Now when the captain of the temple guard and the chief priests heard these words, they were greatly perplexed about them as to what would come of this.